Automatic miniature enlarger



Aug. 1.7, 1943. c. E. YOUNG BERG AUTOMATIC MINIATURE ENLARGER Filed Jan. 27, 1939 I 4 Sheets-Sheet 1 ,lnvewon om E. YoU/v6 f/ec Harney Aug. 17, 1943. c. E. YOUNG BERG 2,327,085

AUTOMATIC MINIATURE ENLARGER Filed Jarr. 27. 1939 4 Sheets-Sheet E.

' c. m2/fw@ #By p( Alitorney.

Aug- 17, 1943- c. E. YOUNG BERG 2,327,086

AUTOMATIC MIN IATURE ENLARGER Filed Jan. 27, 1939 4 Sheets-Sheet' 15701271 i217". 0m E Yom/65596 C, Mw )fr "By Y o ney.

Aug- 17, 1943- c. E. YOUNG BERG 2,327,086

AUTOMAT I C MIN IATURE ENLARGER Filed Jan. 27, 1939 4 Sheets-Sheet 4 Patented Aug. `17, 1943 AUTOMATIC MINIATURE EN'IARGER Carl E. Young Berg, Los Angeles, Calif. applicati@ January ,27, 193s, serial Na. zsarse 2 Claims. (C1. sia-24) This invention relates to a photographic enlarging apparatus, particularly but not necessarily used in 'connection with miniatures.

It is further aimed to provide such an apparatus wherein provision is made for positive automatic focus in'order that rapid change of focus may he effected as 'desired Where large quantities of miniatures or equivalents are made,

lIt is'further aimed to provide a novel structure which may be adjusted sofas to handle work of varioussizesand proportions The more 'specific objects and advantages will become apparent Vfrom a consideration of the description following" taken in connection with accompanying drawings illustrating an operative embodiment.

In said drawings.'

Figure l is a view in side elevation showing one form of the invention, the parts being shown in printing position;

Figure. 21s ja. vertical Section taken on the line 2 2 of Figureli.

Figure 3 is a horizontal sectionv taken on the line 3 3 of Figure l;v

Figure 4 is a. horizontal section taken on the lined-4 of Figure 1;

Figure 5 is a horizontal section taken on the line E-E of Figure 1;

Figure 6 is adetail fragmentarily showing the top of the table and mask thereon;

Figure 'Z yis an enlarged detail V.on the same plane as Figure 2 of the upper parts shown in that gure; 1 1 g -Figure. 8 is a fragmentary, enlarged longitudinal section through a. portion of thev control rod;

rig-,ure 9 is a view similar to Figure a but showing the partsof the control rod released;

Figure 10 isa bottom end view of the upper hollow section of the, control rod;

Figure l1 isa sde'elcvation on a. smaller scale tion; g

Figure l2v isa, vertical section onthe plane of line t2-l2 of Figure 13;

. Yliiguvre k13 is an enlarged plan View of the shield Y* y than Figure. showingl the parts in open posi- Figure 18 is a vertical section taken on the line I8-I8 of Figure 16, and

Figure 19 is a vertical section taken on the line lS-IS of Figure I8;

Figure 20 is a vertical section taken on the line 28-20 of Figure 12;

Figure 21 shows assembly of focusing means;

Figure 22 shows assembly of camera frame and supporting parts.

Referring specifically to the drawings and first to the form disclosed in Figures 1 to 15, la designates a cabinet or table having a top I I provides with a central rectangular opening therethrough adapted to beilluminated by an electric lamp orv the equivalent I2 Within a lamp housing I3. Over such opening in the top II, a miniature or other negative I4 is disposed, the opening prefcrabiy' being provided with a transparent glass panel on which such negative I4 rests. A mask I5 of suitable size may also rest on the glass panel, having an appropriate central opening as shown at Iu, to expose the negative I and overlap the marginal edge portion. of such negative.

Rising rigidly romthe tabletop II is a hollow column I1. Extending into the hollow column is a tubular section Ill-2. A platen or frame IEI for the sensitized paper or equivalent normally rests on the tubular section IUI. Such platen, as best shown in Figure 4, has an opening 2Q therethrough which is. covered by a panel of. transparent glass ZI. Across the top of the glass panel 2|, which panel is. vertically aligned with the negative I4, a sensitized paper or equivalent is disposed when a cover or plate 22 is open as shown in Figure l1. Such cover or plate 22 is pivoted at .'3v to the platen L9.

Betweenthe. top ll and platen i9, a suitable camera. device 24 is disposed and operable at the proper or correct focus, which latter is automatically maintained regardless of the position or adjustment of the parts within the operative limits.

A mirror or reflector 25- may be fastened on the column L'Lfto aid in the positioning of the `sensitizersl paper on the platen I9.

vhas a vertical slidable lip fitting into the verticai grooved. track |30. Lens means also rests on an expansion leaf spring ISI, thus keeping lens Y tire rod device 32 will operate asa unit.

I means expanded, such expansion controlled by means hereafter described. Such lens means is conventional and is manually adjustable for obtainin T the correct focus by a drum |94 and operates as follows: A flexible cable or other elementY 3| is threaded through hole lill and fastened securelyY by screw H35; screw end of drum |64 is passed through hole Hi8 of lens supporting arm F59. Drum It is held in place by nut |09, forc- Y' ing spring m3 lagainst washer |95. A thumb button |08 is attached to screw end of drum I i and is fastened rigidly by nut II il. As drum |64 is turned to adjust the focus of lens means cable element 3|-, spring ISS supplies the tension necesj sary to hold drum adjustably in position. The

connection of these means, will be described later,

operating to automatically maintain the proper;

or correctfocus of the lens means 28 and camera at all times and regardless of lthe angle'of Athe* camera and adjustmentl Vof the parts withinoperative limits. Y Y

vvertically voperable within the kcolumn Il is a control rod 32 made up of a-number of sections and `relatively adjustable for lengthening Vor shortening. This control/rod has a lower section-33 pivoted at 35 to a treadle'35, in turn pivoted at 36 to the Vtable or cabinet I0 and normally maintained in uppermost position by a leaf spring 3l fastened to such cabinet. Section 33,

is screw threaded or otherwise fastened at 38 to a tubular sectionV 3S having lugs 4E]- projecting therefrom through elongated slots lli in the column i'i and elongated slots'42 intheframgZS.

Extending into :the tubular section 3E), is a -1 tubular section 43 which is yadapted to Vbe adjustably'sccured to the section 39VA according to the height or position desired for the platen I9 to cover 22. rihe lowerend-ofsection' 43issplit Vas at 44,' Figures S, 9 and l0,`and a rod 45 isV slidable in the bore of section 43 and has a tapered enlargement 45 at one end `and a'cam 41' Normally secpivcted to the. other end at 48. tion 43 is slidable in section 36.?, but when the cam/il is operated against the upper end of sec-;-

tion 43, rod 45 is pulled relatively to section 43, causing the enlargement 4,51tojspreadthe' lower end of section 43 into tight frictiona] contact with thebore Wall of section'39, whereby th en- ',Platen IS is fastened rigidly but adjustably to the'tubular section-|52, as by a screw 49. The

upper, section cfjcontrol rod`3 has lugs extending laterally therefrom through elongated slot 5| in cover plate 22. Y.

To facilitate Vertical adjustment of the platen y iii, a rack bar E2 dependsfrornY the latter and is engageable by' a pinion 53`carried by a manually operable shaft ,54 journaled in extensions in a' band 53 secured to the column il by a screw '57. The aforesaid mirror-25 is preferably carried by said band 55.

The said Ylamp I Z is adapted to be under control ofa switch which is opened upon downward movement of the-rod 3S by a suitable meansand permitted to open as said'rod` 33 rises,vsuch connections being conventional. y A A To cut off afterglow, a shield is provided at I pivotedat |25- which is movable laterally over andabove the lens meansgZB,y such shield being shown in a closed position in Figure 13, and beingjwurged'to that position by avrockerarm I4, pivoted at H5, connecting with a bar` rI'Iii and the control rod 32. Y At I I9 is shown an elongated slot in frame 2o of sufficient depth to permit lug 4i! aV downwardl motion to force rocker arm II4 into a lateral position as shown at I 20, forcing shield H2 into lateral position as shown at |2I, all of which takesplace with a downward motion of the camera. As the control rod 32reaches the limit of its Jdownward movement it contacts the light I2 and an uninterrupted illumination reaches the sensitized material on platen I9.

However, when the control rod 32 returns into an upward position, it cuts olf the contact of light l2, forces the rocker arm II4 to movershield H2V back into its normal position, thereby cutting off afterglow, and then contacts frame 26, lifting camera into an upward position.

, Reverting to the cord or other iiexible element it is trained over a guide pulley-or the equiv- .alent as at 6l on the frame 26, and such cable or flexible element 3| is fastenedas at 68 to a rotatable drum 69 having'fa cam groove 'I0 therein. A rod HisV disposed `centrally within the drum 69 and mounted aiidfsuspended'from the platen I9 by means of a"bracket T2. A'projec- Y tion or lug 'i3 extends .laterally from rod II through the cam groove 'l0 andhas an indicator F4 thereon movable over a chart l5 fastened by a bracket ID3 to the table orY cabinet IIl. It will be realized that the parts are mathematically-iigured,l constructed' and arranged, so that at all adjustments 'and conditions of operation the indicator ,I4 will,indicatetheenlargement size of ythe'rprint being made at the platen I9 on the chart i5, and that the drum will co-act with the flexible element 3| so as to automatically maintain the lens and parts in proper and accurate focus. Drum S9 has a buttonl rotatably mounted in av fork 1l, rod 'il *dependingA rotatably through such button.

As the screw 5l is releasedyplaten i9 I nay be' raised to any desired position 'byrackbar 52 loperated by pinion- 54, `thus rod l! rigidly attached to bracket "l2 attached to platen' I S is `forced upward, lug 'i3 forces drum 69 to rotate in relation to cam groove lil, which'ismathematically figured at the same .curvature as the curvature of the lens of the camera.

In order to, maintain an accurate count of L orders printed and maintain all prints in relation to their respective orders,Y a munbering stamp TIl Vtreadle 35 is depressed, the control rod 32 will be moved downwardly accordingly with the rlugs, 5|),r moving the cover 22 ont'o the'pla't'en I9 to secure 4the sensitizedpaper therein and also moving y frame 26 and camera 24 on the axis 2l from the position of Figure 'l1 to the position of Figure l,

the lamp i 2 being automatically lighted through the closing of the switch as controlV rod 43 moves downwardly. As such parts move downwardly lug 4i! forcesrocker'arm II to move shield lI I 2'r into' a lateral position, permitting illumination pivoted at lill; The bar IIE Visin turn attached Y to shield H2 andpivoted at-II3.. Rocker arm H4 has an elongated slot fitted over lug 40 ofV to reach sensitized paper.k During this action,

as previously describedthe .cable 3| vin combination with the drum andassociated parts, will maintain the proper focus automatically. After completing exposure, lug 40 forces rocker arm H4 to move shield H2 into its normal position, thus preventing afterglow. It will be particularly noted that, regardless of the adjustment of the parts, and particularly the platen within the limits of adjustment, the focus will be automatically maintained.

Various changes may be resorted to provided they fall within the spirit and scope of the invention. For instance, .the form of Figures 16 to 19 may be resorted to. In this form, a table or cabinet is provided as at 80 having a column 3| rising therefrom in which another column 82 is adjustably secured by a screw 83. A bracket 84 is adjustable alongr the column 82V and secured thereto through the binding engagement of a screw 85 therewith. A pulley 86 is slidable along the column 82 and rotatable on the same to a limited extent, limited through the engagement of a projection 81 on the pulley in a cam slot 88 of the column 82.A Lugs 89 on arms 90 of the bracket 84 causes the pulley to follow the movement of the bracket along the column 82.

Said arms 99 are in parallelism and support a conventional camera 9i having lens means 92 at the lower end with focus adjusting means 93 of conventional'form'therefor. To such means 93, a cable or flexible element 94 is connected as at 95, the cable passing over a guide pulley or the like' 96 fastened to one of the arms 99 and being trained over and connected at its other end to the pulley 86. A lamp housing 91 is disposed above camera 9| and a negative is adapted to be disposed at the base of the lamp housing in a, suitable frame 98, and thus between the light source and the vlens y92. In this instance, the sensitized paper or the like 99 is disposed on the table 80. f

In the use of the device of Figures 16 to 19, the bracket and all `parts carried thereby is adapted for vertical movement on the column 82 upon loosening the screw 85, in order to obtain the desired size enlargement.` It will be clear that through such movement, the pulley 86 will be rotated slightly bythe cable 94 as Well as slide along the column, due to the coaction of the projectionl in thecam slot 88, so that regardless of the position of the parts within operative limits, the focus will be automatically maintained.

Any adjustments necessary in the focusing in either form of the invention, as through stretching of the cables or exible elements 3| and 94, the same may be compensated for through the adjustment of the means 29 and 93.

I claim as my invention:

l. Photographic apparatus as described comprising in combination a fixed table having a light aperture for a negative, a light source below said table, a pedestal secured to said table, a platen having a light aperture for a positive slidably mounted on said pedestal and having a rack bar, a manually actuated pinion on said pedestal adapted for vertical adjustment of said platen, lens means pivotally supported on said table, a cover plate for said platen pivotally connected thereto, rod means in said pedestal connected to said cover plate and said lens means support,

said rod means comprising a pair of telescoped tubes and a cam member adapted to eifect adjustable friction engagement between the tubes, pedal actuating means for said rod, spring means operatively connected to said rod adapted to retain said cover plate and lens means in elevated position with respect to said platen and table respectively, said cover plate and lens means being adapted to be brought into contact with said platen and table respectively when said pedal is actuated, said light source adapted to be established when said pedal is actuated and to be extinguished when said pedal is released.

2. Photographic apparatus as described comprising in combination a fixed table having a light aperture for a negative, a pedestal secured to said table, a platen having a light aperture for ay positive secured to said pedestal and adapted for vertical adjustment thereon, a mirror on said pedestal for viewing said negative, lens means pivotally supported on said table, a shutter for said lens means, a cover plate for said platen pivotally connected thereto, adjustable length rod means in saidpedestal connected to said cover plate and having a cam lever to facilitate the adjustment thereof, said lens means Support and said shutter, pedal actuating means for said rod, spring means operatively connected to said rod adapted to retain said cover plate and lens means in elevated position with respect to said platen and table respectively, and to keep said shutter over said lens, said cover plate and lens means being adapted to be brought into Contact with said platen and table respectively and said shutter adapted to be removed from said lens when said pedal is actuated, said shutter adapted to be placed over said lens when said pedal is released and prior to the actuation of said rod to elevate said cover plate and lens means.

Y CARL E. YOUNG BERG 

